Telephone-receiver



C. S. BABCOCK AND F. G. NORTON.

TELEPHONE RECEIVER.

APPLICATION FILED FEB.19. 1914. RENEWED JUNE 23,1919.

1,324,222; E Patented Dec. 9, 1919.

W H l UNITED STATES PATENT OFFICE. I

CHARLES S. BABCOCK AND FREDERICK GAYLORD' NORTON, OF CHICAGO, ILLINOIS.

TELEPHONE-RECEIVER.

Patented Dec, 9, 1919.

Application filed February 19, 1914, Serial No. 819,744. Renewed J'une'23, 1919. Serial No. 306,208.

To all whom it may concern:

Be it known that we, CHARLES S. BAB- COOK and FREDERICK GAYLoRo NORTON, citizens of the United States, residing at 1933 West Sixty-ninth street, in the-city of Chi cago andState of Illinois, have invented a Yl'neW and useful Telephone-Receiver, of

which the following is a specification.

' Our invention relates to improvements in telephone receivers in which a new vibrating body is substituted in place of the metal disk or diaphragm,now in use to reproduce the sound received from the transmitter. We use to produce the sound, either singly or in combination, a violin, viola, Violoncello,

bass viol, mandolin, guitar or any musical instrument having strings and a hollow body vibrating in sympathy with or in response to the vibration of the strings. By the use of said'instruments (singly and in combination), especially those of the violin family, by our invention we are able to reproduce tones, especially musical ones, with more fidelity as to quality than with any telephone receiver nowin. use. The violin is especiall adapted to the reproduction of 1 the tones, aving a pitch above the tone Gr,

below middle 0, and the viola, Violoncello and double bass are in like manner adapted for tones fallin within the respective compasses. We attain these objects by the mechanism ill'ustratedin the accompanying diagrammatic drawingin which Figures 1 to 4, inclusive, are cross sections of the invention.

Similar letters refer to similar parts i throughout the several views.

We find that if an electromagnet Min which the magnet iron is either permanently magnetized-as in one type of the common'telephone' receiver, or is made of soft iron as in another type of receivers, is fitted with an armature =-A,fle'xible and secured at the ends, and said armature A placed at a suitable distance from said magnets and the said armature attached by a rod of any i vmaterial to any part of the musical instrument which vibrates in emitting musical sounds, as hereinbefore described, that the instrument will .be setin vibration by the electrical currents carrying from a suitable transmitter words and musical sounds and.

that the musical instrument will reproduce said sounds. The armature A may be round in the shape of the diagram of the common telephone receiver and secured in like manner, or it may be in the shape of a flatstrip of suitable iron secured at its ends. In either case the armature A, whether an ordinary telephone receiver, is used, or it is in the shape of a strip of metal, emits no soundwhen connected to a violin or other musical instrument, but all vibrations received by it are transmitted directly to the violin or other instrument and by said instrument made audible.

While the said metal diaphragm or strip attached to any part of the violin or other instrument as aforesaid will cause the said musical instrument to talk and reproduce sounds, yet in practice we have found that the best place on the violin or other instrument to which to attach the said rod is the bridge. 7

Fig. 1 shows the magnet with the armature attached directly from its center to the center of the bridge B of the violin V by the rod L. This rod shall be stifi enough to take care of the vibration received by it and should be securely attached to the saidbridge B.

Fig. 2 shows the said magnets and arma ture and the said rod L as a projection from the bridge B and then'connected by L at' ets and armaand L shall be between the said fulcrum F i and the bridge B.

In all cases the armature and magnets should be attached firmly to a supportwhich should carry the violin, holding it firmly and touching only at points which do not vibrate, and if a fulcrum is used the said fulcrum should be rigidly attached likewise to said support.

"to the rod L, y

To obtain thebestresults the armature A should be so arranged that its pull should be in the same plane as the bridge or directly across the body of the violin. In this regard the drawings show accurately the arrangement of the armature A in reference to the violin or other instrument.

The different arrangements shown in the drawings, the introduction of the fulcrum F are necessary to accommodate the amplitude and strength of the vibrations of the armature A to the vibrations of the various instruments employed and also to accommodate the exigencies of construction. In all various connections shown, care should be taken that there should be no lost motion in any of the parts. This end may be attained by giving slight tension to the armature A in the direction of the rod L.

The instruments need not be tuned as for playing in the natural Way, but sufficient tension should be given the strings to bring the instrument up to its full power of vibration. More than one instrument may be coupled in multiple; for instance, the violin, viola, Violoncello and bass viol, thus giving a receiver capable for reproducing the sounds of a large orchestra or chorus with some fidelity as to the ori inal quality. Suitable conductor coils may e used to advantage. fWhen a direct current magnet is used, that is to say, a magnet made of soft iron, the inductioncoil should be designed to permit of the flow of electrical current of low voltage through the secondary in the same direction as the induced current;

We claim:

1. The combination of an electromagnet and armature suitable respectively for receiving and responding to telephonic cur:

above set forth.

2. The combination of an electromagnet and an armature therefor, suitable respectively to receive and respond to telephonic currents, a stringed instrument having a bridge and a rod firmly attached at one end to the armature and to the bridge at a point on the rod remote from the armature.

8. The combination of an electromagnet, a flexible strip of iron, fastened securely at each end to serve as an armature, and suitable respectively for receiving and responding to telephonic currents, a stringed instrument having a bridge thereon and means for firmly connecting the armature to the bridge.

4:. The combination of an electromagnet, a flexible strip of iron fastened securely at each end to serve as an armature, suitable respectively for receiving and responding to telephonic currents, a stringed instrument having a bridge and a rod firmly attached at a point on the rod remote from the armature.

CHARLES S. BABCOCK. FREDERICK GAYLORD NORTON. Witnesses:

JOEL BAKER, ELIZABETH B. SMYTH. 

